Fix tests

Author: SylvainCorlay

ipykernel/control.py

@@ -9,7 +9,7 @@
 
 class ControlThread(Thread):
 
-    def __init__(self, log=None, **kwargs):
+    def __init__(self, **kwargs):
         Thread.__init__(self, **kwargs)
         self.io_loop = IOLoop(make_current=False)
         self.pydev_do_not_trace = True

ipykernel/kernelapp.py

@@ -345,7 +345,8 @@ def close(self):
             self.iopub_thread.stop()
             self.iopub_thread.close()
 
-        self.debug_shell_socket.close()
+        if self.debug_shell_socket:
+            self.debug_shell_socket.close()
 
         for channel in ('shell', 'control', 'stdin'):
             self.log.debug("Closing %s channel", channel)

ipykernel/kernelbase.py

@@ -187,8 +187,8 @@ def __init__(self, **kwargs):
                                  self.session)
 
         self.control_queue = Queue()
-        kwargs['control_thread'].io_loop.add_callback(self.poll_control_queue)
-
+        if 'control_thread' in kwargs:
+            kwargs['control_thread'].io_loop.add_callback(self.poll_control_queue)
 
     @gen.coroutine
     def dispatch_debugpy(self, msg):